Brand: GHK

Material: Rubber (including specialized grey O-ring)

Compatible with: All GHK GBB Gas Magazine Series (M4 / AK / G5 / AUG / 553 / G17)

Weight: Approx. 2g (per set)

Length: Varies by O-ring size (includes 4 different sizes)

System: Output valve sealing system for gas-tight performance